5-4
Alignment and Adjustments
1) Pour 275±15cc of 20±5ûC(68±9ûF) water in a beaker which
is graduated to 600cc, and place the beaker in the center of
the oven.
2) Start to operate the oven and measure the leakage by using
a microwave energy survey meter.
3) Set survey meter with dual ranges to 2,450MHz.
4) When measuring the leakage, always use the 2 inch spacer
cone with the probe. Hold the probe perpendicular to the
cabinet door. Place the spacer cone of the probe on the
door and/or cabinet door seam and move along the seam,
the door viewing window and the exhaust openings
moving the probe in a clockwise direction at a rate of 1
inch/sec. If the leakage testing of the cabinet door seam is taken near a corner of the door, keep the probe
perpendicular to the areas making sure that the probe end at the base of the cone does not get closer than 2
inches to any metal. If it gets closer than 2 inches, erroneous readings may result.
5) Measured leakage must be less than 4mW/cm
2
, after repair or adjustment.
5-12 Leakage Measuring Procedure
5-9 Procedure for Measurement of Microwave Energy Leakage
5-11 Note on Measurement
5-10 Check for Microwave Leakage
5-13-1 Record keeping and notification after measurement
1) After adjustment and repair of a radiarion preventing device, make a repair record for the measured
values, and keep the data.
2) If the radiation leakage is more than 5 mW/cm
2
after determining that all parts are in good condition,
functioning properly and the identical parts are replaced as listed in this manual notift that fact to ;
CENTRAL SERVICE CENTER
5-13-2 At least once a year have the microwave energy survey meter checked for accuracy by its manufacturer.
1. Remove the outer panel.
2. Pour 275±15cc of 20±5ûC(68±9ûF) water in a beaker which is
graduated to 600cc, and place the beaker in the center of
the oven.
3. Start the oven at the highest power level.
4. Set survey meter dual ranges to 2,450MHz.
5. Using the survey meter and spacer cone as described
above, measure arnear the opening of magnetron, the
surface of the air guide and the surface of the wave guide
as shown in the following photo.( but avoid the high
voltage components.) The neading should be less than
4mW/cm2.
1) Do not exceed the limited scale.
2) The test probe must be held on the grip of the handle, otherwise a false reading may result when the
operator's hand is between the handle and the probe.
3) When high leakage is suspected, do not move the probe horizontally along the oven surface; this may
cause damage to the probe.
4) Follow the recommendation of the manufacturer of the microwave energy survey meter.
Maximum allowable leakage is 5mW/cm
2
.
4mW/cm
2
is used to allow for measurement and meter accuracy
